Dear Experts,
Please refer trail official interpretation of ASME Section IX.
Interpretation: IX-04-15
Subject: QW-407.2, Base Metal Thickness Qualification and QW-407.2, PWHT Temperature and Time Range
Date Issued: December 22, 2004
File No: 04-1595
Question (1): Will a procedure qualification test coupon on 1.5 in. thick P-No. 1, Gr. 2 material and post weld heat treated at 1100 deg. F. for 1.5 hours with supplementary essential variable requirements met, support a WPS with supplementary essential variable requirements for production welding on 8 in. thick P-No. 1, Gr. 2 material that is PWHT at 1100 deg. F. for 3.5 hours?
Reply (1): No.
Question (2): Based on the conditions stated in Question 1, could the PWHT time on the 8 in. thick weldment be increased to 4 hours and 10 minutes at 1100 deg. F. and still be in compliance with Code requirements?
Reply (2): No.
As per my opinion
Answer as 'NO' is correct because requirement of at least 80% soaking time on test coupon is not meeting in both the cases.
Case-1 : Soaking time on test coupon as 1.5 Hr is much less than 80% of 3.5 Hr soaking time given to production weld
Case-2 : Soaking time on test coupon as 1.5 Hr is much less than 80% of 4.0 Hr & 10 Min. soaking time given to production weld
I have also seen previous expert replies for same subject as mentioned below
Thus the maximum time (Tmax) at temperature is : (Tqual/Tmax) X 100 = 80
Or Tmax = Tqual X ( 100/80) = 1.5 hr X (5/4) = 1.875 hours
So the PQR does not have a long enough hold time to support the proposed WPS's 3.5 hour hold time.
John A. Henning
Senior Welding & Materials Engineer
Please let me know out of following two interpretations, which interpretation is correct ?
1) QW-407.2 (including at least 80% of the aggregate times at temperature(s) ) is mean to specify minimum 80% of total aggregate time at temperatures for PWHT for established PQR
OR
2) QW-407.2 is mean to specify Maximum 1.25 time of total aggregate time at temperatures for PWHT for established PQR.
Kindly clarify.
--
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The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
Please refer trail official interpretation of ASME Section IX.
Interpretation: IX-04-15
Subject: QW-407.2, Base Metal Thickness Qualification and QW-407.2, PWHT Temperature and Time Range
Date Issued: December 22, 2004
File No: 04-1595
Question (1): Will a procedure qualification test coupon on 1.5 in. thick P-No. 1, Gr. 2 material and post weld heat treated at 1100 deg. F. for 1.5 hours with supplementary essential variable requirements met, support a WPS with supplementary essential variable requirements for production welding on 8 in. thick P-No. 1, Gr. 2 material that is PWHT at 1100 deg. F. for 3.5 hours?
Reply (1): No.
Question (2): Based on the conditions stated in Question 1, could the PWHT time on the 8 in. thick weldment be increased to 4 hours and 10 minutes at 1100 deg. F. and still be in compliance with Code requirements?
Reply (2): No.
As per my opinion
Answer as 'NO' is correct because requirement of at least 80% soaking time on test coupon is not meeting in both the cases.
Case-1 : Soaking time on test coupon as 1.5 Hr is much less than 80% of 3.5 Hr soaking time given to production weld
Case-2 : Soaking time on test coupon as 1.5 Hr is much less than 80% of 4.0 Hr & 10 Min. soaking time given to production weld
I have also seen previous expert replies for same subject as mentioned below
Reply of a
Because the supplementary essential variables must be met, the proposed WPS is not allowed - i.e. in QW-407.2 there is a maximum limit on time at temperature. Specifically, "The procedure qualification test coupon . . . at least 80% of the aggregate time at temperature."
Thus the maximum time (Tmax) at temperature is : (Tqual/Tmax) X 100 = 80
Or Tmax = Tqual X ( 100/80) = 1.5 hr X (5/4) = 1.875 hours
So the PQR does not have a long enough hold time to support the proposed WPS's 3.5 hour hold time.
John A. Henning
Senior Welding & Materials Engineer
Please let me know out of following two interpretations, which interpretation is correct ?
1) QW-407.2 (including at least 80% of the aggregate times at temperature(s) ) is mean to specify minimum 80% of total aggregate time at temperatures for PWHT for established PQR
OR
2) QW-407.2 is mean to specify Maximum 1.25 time of total aggregate time at temperatures for PWHT for established PQR.
Kindly clarify.
--
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding+unsubscribe@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
http://www.linkedin.com/groups/MaterialsWelding-122787?home=&gid=122787&trk=anet_ug_hm
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
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